APA (7th ed.) Citation

Brekke, A., & Egeland, A. (1994). The northern lights: Their heritage and science. Grndahl Dreyer.

Chicago Style (17th ed.) Citation

Brekke, Asgeir, and Alv Egeland. The Northern Lights: Their Heritage and Science. Oslo: Grndahl Dreyer, 1994.

MLA (8th ed.) Citation

Brekke, Asgeir, and Alv Egeland. The Northern Lights: Their Heritage and Science. Grndahl Dreyer, 1994.

Warning: These citations may not always be 100% accurate.